fix: make sure that cargo test
can be killed with ctrl+c
#6803
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I am not sure why we were catching ctrl+c in the first place. This was
introduced in #4229 I think. But messing up with signal handlers in
tests doesn't feel right and, indeed, prevents tests from being killed.
Test Plan
Manual testing: running
cargo t -p integration-tests
and then killingit in the middle with ctrl+c leaves the test running in the background
before this PR, and properly kills the process after.